Module 15.21 Operation and monitoring Flashcards
What effect does moving the throttle lever from the idle have?
Causes the fuel control system to supply more fuel as the engine increases
What position must the throttle lever be in for thrust reversers to deploy?
Idle
How should the aircraft be positioned for an engine run up?
Into the wind with chocks fitted and brakes on
What distance in front of the engine on a run-up must be clear?
10m
Does ATC need to be informed of a ground run?
Yes, permission, duration and ground run type must be given
Should the beacon lights be on during an engine ground run?
Yes
When the engine/s are running, what can be carried out?
Engine trimming
Why must both engines be run?
To prevent asymmetry
When can engine power be increased above idle?
When absolutely necessary
When carrying out acceleration checks on aircraft engines, what engine must be used as datum?
The oldest engine
How long should the engine be left at idle before turning off to allow for cool down?
5 mins
What indications are used for engine monitoring?
- EPR
- N1 and N2 (N3)
- FF
- EGT
How do centrifugal compressor engines measure engine power?
Engine RPM and Jet Pipe Temperature (JPT)
What is the EPR the ratio between?
Jet pipe pressure and compressor inlet
What method of power measurement do axial flow bypass engines use?
EPR
Torque monitoring systems are used to indicate the power on what engines?
Turboprop and turboshaft
Torque monitoring systems can also be used for what?
- Auto operate feathering system
- Assist in auto operation of water injection system
- Limit engine output
- Balance power between engines
What are the methods of displaying torque in the flight deck?
- Torque oil pressure
- torque percentage
- Direct horsepower read out
What are the two types of torque sensing systems?
- Hydromechanical
- Phase displacement
When would an engine be removed?
Change of time limited parts or repair of damages
What performs the aircraft data recording?
Aircraft Condition Monitoring System (ACMS)
What compiles the ACMS data reports?
Data Management Unit
How can these ACMS reports be accessed?
Printing or via ground data link
What does thermodynamic analysis identify?
Wear of gas path components during engine operation
